The horizontal column location is critical for
correctly decoding the numbers. There are 7 items possible with the first
item listed directly below the first letter of the rear axle code, or column
number 15 and the column number is how they will be designated below. The
Fremont, CA. plant apparently had their own method of labeling these options
as many times they used numbers such as 2 , 4, 5, and sometimes a letter that did not correspond
to the other plants. The meaning of these "other" numbers/letters is unknown.